Vegetation community river cross section average flow velocity longitudinal distribution prediction method

Abstract

The invention discloses a method for predicting longitudinal distribution of average flow velocity of a cross section of a riverway with vegetation communities. A riverway is divided into a vegetationarea and a non-vegetation area in the direction perpendicular to water flow. Through the constructed vegetation area flow velocity distribution prediction model and the constructed non-vegetation area flow velocity distribution prediction model, the prediction of the average flow velocity longitudinal distribution of the cross sections of the predicted vegetation area and the non-vegetation areacan be realized at the same time, and a theoretical basis is provided for further development of vegetation community evolution research.

Description

technical field [0001] The invention belongs to the fields of hydraulics and river dynamics, and relates to a method for predicting flow velocity distribution of a river course with vegetation communities, in particular to a prediction method for flow velocity distribution of river courses with non-submerged vegetation communities. Background technique [0002] Generally, vegetation grows in natural rivers in different forms, and there are two common forms: (1) vegetation grows in communities in the river overflow area and (2) vegetation covers a large area on both sides of the river. Vegetation communities growing in the river flow area will change the water flow conditions in the local area and affect the evolution of the river bed. The length-to-width ratio (L / D, L is the length of the community; D is the width of the community) of the vegetation community in the river channel flow area is usually: L / D≈1.5~6. This is due to the interaction between vegetation, water flow ...

AI Technical Summary

Problems solved by technology

However, under natural conditions, it is difficult to take a long time to continuously measure the flow velocity distribution in and around the vegetation community

This is because the measurement of flow velocity takes a lot of time, and the flow conditions in natural rivers are not constant, and the measurement results will change with the change of upstream flow, which may easily lead to unrepresentative measurement results.

Under laboratory conditions, although the detailed flow velocity distribution in and around the community can be measured under constant and uniform water flow conditions, it takes a lot of time, manpower and money to complete the measurement work

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